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Frontier decoder for quantum LDPC codes: pruned dynamic programming over boundary states for approximate logical maximum-likelihood decoding of sparse parity-check and detector-error-model matrices.
A complete, deterministic implementation of the GF(4)-symplectic framework for quantum error correction, featuring the Steane [[7,1,3]] code with 12 verification checks. Includes CSS code constructor, Shor code verification, and flagged circuit fault simulation. Pure Python, no dependencies.